Haier AB092FCAHA, Service Manual

Page: 101 / 174

8.11 Refrigerant
MRV central air conditioner uses refrigerant “R22”. This refrigerant itself is innocuous, non-combustible
safety refrigerant. But then, when arranging the air conditioner equipment, it is necessary to
take some steps to take precautions against in case of the indoors refrigerant leakage. Such as,
the room size shall be taken into account to avoid making the concentration of the refrigerant
not exceed the concentration limit and other relevant steps. The concentration limit is the
concentration that is not harmful to human body and can take emergency steps to treat the
concentration of Freon.
Concentration limit of R22: 0.3kg/m3
1. Sequence of refrigerant concentration affirmance
Calculate the refrigerant concentration according to the following sequence.
(1)
Calculate the total refrigerant-charging amount of each of the refrigerating system (kg).
l
Refrigerant charging amount of outdoor Additional refrigerant charging amount
= Total refrigerant charging amount of the refrigerating equipment (kg).
l
Refrigerant charging amount of outdoor system: Refrigerant charging amount when air
conditioner leaves factory.
l
Additional refrigerant charging amount: Additional refrigerant charging amount
according to the site pipe length and pipe diameter.
(2) Calculate the minimum size of the room suitable for the indoor unit assembly (m3).
(3) Calculate the concentration of refrigerant:
Total refrigerant charging amount of refrigerating equipment/the minimum room size suitable
for indoor unit assembly (m3)
≤
Refrigerant concentration limit: 0.3kg/ m3
2. Countermeasure when exceeding the concentration limit
(1) Set an effective opening for ventilation and fresh air.
l
Cut an intake respectively on the upper and lower part of the door which areas are
equivalent to 0.15% grounding area, or cut an intake in other part of the room.
(2) Reduce the total refrigerant charging amount of the refrigerating equipment
l
Shorten the refrigerant pipe length. Reduce the installation place distance between the
outdoor unit and the indoor unit to shorten the refrigerant pipe length, so that reduce the
total refrigerant charging amount of the refrigerating equipment.
(3) Establish ventilation and fresh air system
l
Establish a mechanical equipment for fresh air to keep the refrigerant concentration
below the concentration limit (normal ventilation)\
l
When can not ventilate the normally, please set an alarm apparatus linked with the
mechanical ventilation equipment.